Effect of Heat Treatment on Mechanical Properties of AISI 4147 Spring Steel

Sharma , S S and Jagannath, K and Bhat, Chandrashekhar and Kini, Achutha U and Prabhu, P R and Jayashree, P K and Gowri Shankar , M C (2013) Effect of Heat Treatment on Mechanical Properties of AISI 4147 Spring Steel. In: 3rd International Conference on Mechanical, Automotive and Materials Engineering (ICMAME'2013), April 29-30, 2013, Singapore.

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Abstract

Today steel is the most important resource in this industrialized world. It forms the basic building material of today’s structure. Moreover steels with large chromium and vanadium percentage can be used as spring steels which form the suspension system. Prevention of wear and increase in steel life depends principally on the design and operation on the component, but providing some pre-use treatment on steel can also improve the quality to a great extent. It has been seen that most of the study focuses on the experimental testing of the steel component and very few focuses on the material testing and improving its properties beforehand. One of the processing routes to alter the properties is heat treatment. Nearly 90% of the springs are used in heat treated conditions. The major requirement for the conventional spring steel is toughness, strength & hardness. In this view, it is proposed to study the mechanical and tribological properties of AISI 4147 (EN47) spring steel with different heat (thermal) treatments like normalizing, hardening and tempering. All heat treatments are carried out in atmospheric condition. Hardening treatment improves hardness of the material, a marginal decrease in hardness value with improved ductility is observed in tempering. Hardening and longer duration tempering show better wear resistance compare to other heat treatments. Both mild and severe wear regions are observed. Generally mild wear region is observed above 5 hours of continuous running of the specimen. Microstructural analysis shows the existence of pearlitic structure in as bought & normalized specimens, lath martensitic structure in hardened specimen.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: tempering, hardness, heat treatment, normalizing, toughness
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 11 May 2013 09:37
Last Modified: 06 Nov 2013 06:24
URI: http://eprints.manipal.edu/id/eprint/95020

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